Display device

ABSTRACT

A display device includes: a first pixel, a second pixel, and a third pixel from which lights of different colors are respectively emitted; in the first pixel, a first light conversion layer overlapping a first color filter; in the second pixel, a second light conversion layer overlapping a second color filter; and in the third pixel, a third light conversion layer overlapping a third color filter. The first light conversion layer, the second light conversion layer, and the third light conversion layer respectively include a quantum dot, and an amount of the quantum dot included in the first light conversion layer is larger than each of amounts of the quantum dot respectively included in the second light conversion layer and the third light conversion layer.

This application claims priority to Korean Patent Application No.10-2018-0123909 filed on Oct. 17, 2018, and all the benefits accruingtherefrom under 35 U.S.C. § 119, the entire contents of which areincorporated herein by reference.

BACKGROUND (a) Field

The present disclosure relates to a display device.

(b) Description of the Related Art

A liquid crystal display is one of flat panel displays that are nowwidely used. The liquid crystal display includes two display panels inwhich field generating electrodes such as pixel electrodes and commonelectrodes are formed, and a liquid crystal layer interposed between thedisplay panels. In the liquid crystal display, a voltage is applied tothe field generating electrodes to generate an electric field in theliquid crystal layer, which determines the direction of liquid crystalmolecules of the liquid crystal layer, and an image is displayed bycontrolling the polarization of incident light.

An emissive display device includes a light emitting layer interposedbetween two electrodes, one for injecting electrons and the other forinjecting holes to the light emitting layer. The injected electrons andholes are coupled at the light emitting layer, and excitons are therebyformed. The formed excitons emit light while discharging energy. Theemissive display device displays a predetermined image by using thisemission of light.

Such a display device may cause a pixel stain or color differencesrelative to a design or structure of the display device.

SUMMARY

The exemplary embodiments provide a display device for which a pixelstain or a color difference is minimized or effectively prevented.

A display device includes: a first pixel, a second pixel, and a thirdpixel from which lights of different colors are respectively emitted; inthe first pixel, a first light conversion layer overlapping a firstcolor filter; in the second pixel, a second light conversion layeroverlapping a second color filter; and in the third pixel, a third lightconversion layer overlapping a third color filter. The first lightconversion layer, the second light conversion layer, and the third lightconversion layer respectively include a quantum dot provided inplurality, and an amount of the quantum dot included in the first lightconversion layer is larger than each of amounts of the quantum dotrespectively included in the second light conversion layer and the thirdlight conversion layer.

A thickness of the first light conversion layer may be greater than eachof a thickness of the second light conversion layer and a thickness ofthe third light conversion layer.

The amount of the quantum dot included in the second light conversionlayer and the amount of the quantum dot included in the third lightconversion layer may be the same.

The thicknesses of the second light conversion layer and the third lightconversion layer may be the same.

Each of the first pixel, the second pixel, and the third pixel mayinclude: a transistor; a pixel electrode connected to the transistor; acommon electrode facing the pixel electrode; and a liquid crystal layerdisposed between the pixel electrode and the common electrode.

Each of the first pixel, the second pixel, and the third pixel mayinclude: a transistor; a light emitting diode (“LED”) connected to thetransistor; and an encapsulation layer on the light emitting diode(“LED”).

A display device includes: a first pixel, a second pixel, and a thirdpixel from which lights of different colors are respectively emitted; inthe first pixel, a first light conversion layer overlapping a firstcolor filter; in the second pixel, a second light conversion layeroverlapping a second color filter; and in the third pixel, a third lightconversion layer overlapping a third color filter. The first lightconversion layer, the second light conversion layer, and the third lightconversion layer respectively include a quantum dot provided inplurality, and an amount of the quantum dot included in the first lightconversion layer and an amount of the quantum dot included in the secondlight conversion layer are each larger than an amount of the quantum dotincluded in the third light conversion layer.

A thickness of the first light conversion layer and a thickness of thesecond light conversion layer may both be greater than a thickness ofthe third light conversion layer.

The amount of the quantum dot included in the first light conversionlayer and the amount of the quantum dot included in the second lightconversion layer may be the same.

The thicknesses of the first light conversion layer and the second lightconversion layer may be the same.

Each of the first pixel, the second pixel, and the third pixel mayinclude: a transistor; a pixel electrode connected to the transistor; acommon electrode facing the pixel electrode; and a liquid crystal layerdisposed between the pixel electrode and the common electrode.

Each of the first pixel, the second pixel, and the third pixel mayinclude: a transistor; a light emitting diode connected to thetransistor; and an encapsulation layer on the light emitting diode.

A display device includes: a first display panel including a transistorand an electrode which is connected to the transistor; a second displaypanel including a first color filter overlapping a first lightconversion layer, a second color filter overlapping a second lightconversion layer, and a third color filter overlapping a third lightconversion layer. The first light conversion layer, the second lightconversion layer, and the third light conversion layer respectivelyinclude a quantum dot provided in plurality, and an amount of thequantum dot included in the first light conversion layer is larger thanan amount of the quantum dot included in the second light conversionlayer or an amount of the quantum dot included in the third lightconversion layer.

The amount of the quantum dot included in the first light conversionlayer may be larger than each of the amount of the quantum dot includedin the second light conversion layer and the amount of the quantum dotincluded in the third light conversion layer.

A thickness of the first light conversion layer may be greater than eachof a thickness of the second light conversion layer and a thickness ofthe third light conversion layer.

The amount of the quantum dot included in the second light conversionlayer and the amount of the quantum dot included in the third lightconversion layer may be the same. The thickness of the second lightconversion layer and the thickness of the third light conversion layermay be the same.

The amount of the quantum dot included in the first light conversionlayer and the amount of the quantum dot included in the second lightconversion layer may be both larger than the amount of the quantum dotincluded in the third light conversion layer.

A thickness of the first light conversion layer and a thickness of thesecond light conversion layer may be both greater than a thickness ofthe third light conversion layer.

The amount of the quantum dot included in the first light conversionlayer and the amount of the quantum dot included in the second lightconversion layer may be the same. The thickness of the first lightconversion layer and the thickness of the second light conversion layermay be the same.

The display device may further include a liquid crystal layer disposedbetween the first display panel and the second display panel.

The display device may further include a light emitting diode (“LED”)connected to the transistor and including the electrode; anencapsulation layer disposed on the light emitting diode (“LED”); andthe second display panel disposed on the encapsulation layer.

According to one or more exemplary embodiment, a pixel stain may bereduced or effectively prevented or a color difference may be minimized.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other advantages and features of this disclosure willbecome more apparent by describing in further detail exemplaryembodiments thereof with reference to the accompanying drawings, inwhich:

FIG. 1 to FIG. 8 are respectively enlarged cross-sectional viewsschematically showing exemplary embodiments of a display device.

DETAILED DESCRIPTION

The invention will be described more fully hereinafter with reference tothe accompanying drawings, in which exemplary embodiments of theinvention are shown. As those skilled in the art would realize, thedescribed embodiments may be modified in various different ways, allwithout departing from the spirit or scope of the invention.

In describing the invention, parts that are not related to thedescription will be omitted. Like reference numerals generally designatelike elements throughout the specification.

In addition, the size and thickness of each configuration shown in thedrawings are arbitrarily shown for better understanding and ease ofdescription, but the invention is not limited thereto. In the drawings,the thickness of layers, films, panels, regions, etc., are exaggeratedfor clarity. In the drawings, for better understanding and ease ofdescription, the thicknesses of some layers and areas are exaggerated.

It will be understood that when an element such as a layer, film,region, or substrate is referred to as being related to another elementsuch as being “on” another element, it can be directly on the otherelement or intervening elements may also be present. In contrast, whenan element is referred to as being related to another element such asbeing “directly on” another element, there are no intervening elementspresent. Further, in the specification, the word “on” or “above” meanspositioned on or below the object portion, and does not necessarily meanpositioned on the upper side of the object portion based on agravitational direction.

It will be understood that, although the terms “first,” “second,”“third” etc. may be used herein to describe various elements,components, regions, layers and/or sections, these elements, components,regions, layers and/or sections should not be limited by these terms.These terms are only used to distinguish one element, component, region,layer or section from another element, component, region, layer orsection. Thus, “a first element,” “component,” “region,” “layer” or“section” discussed below could be termed a second element, component,region, layer or section without departing from the teachings herein.

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting. As used herein, thesingular forms “a,” “an,” and “the” are intended to include the pluralforms, including “at least one,” unless the content clearly indicatesotherwise. “At least one” is not to be construed as limiting “a” or“an.” “Or” means “and/or.” As used herein, the term “and/or” includesany and all combinations of one or more of the associated listed items.In addition, unless explicitly described to the contrary, the word“comprise” and variations such as “comprises” or “comprising” will beunderstood to imply the inclusion of stated elements but not theexclusion of any other elements.

Furthermore, relative terms, such as “lower” or “bottom” and “upper” or“top,” may be used herein to describe one element's relationship toanother element as illustrated in the Figures. It will be understoodthat relative terms are intended to encompass different orientations ofthe device in addition to the orientation depicted in the Figures. Forexample, if the device in one of the figures is turned over, elementsdescribed as being on the “lower” side of other elements would then beoriented on “upper” sides of the other elements. The exemplary term“lower,” can therefore, encompasses both an orientation of “lower” and“upper,” depending on the particular orientation of the figure.Similarly, if the device in one of the figures is turned over, elementsdescribed as “below” or “beneath” other elements would then be oriented“above” the other elements. The exemplary terms “below” or “beneath”can, therefore, encompass both an orientation of above and below.

“About” or “approximately” as used herein is inclusive of the statedvalue and means within an acceptable range of deviation for theparticular value as determined by one of ordinary skill in the art,considering the measurement in question and the error associated withmeasurement of the particular quantity (i.e., the limitations of themeasurement system). For example, “about” can mean within one or morestandard deviations, or within ±30%, 20%, 10% or 5% of the stated value.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which this disclosure belongs. It willbe further understood that terms, such as those defined in commonly useddictionaries, should be interpreted as having a meaning that isconsistent with their meaning in the context of the relevant art and thepresent disclosure, and will not be interpreted in an idealized oroverly formal sense unless expressly so defined herein.

Exemplary embodiments are described herein with reference to crosssection illustrations that are schematic illustrations of idealizedembodiments. As such, variations from the shapes of the illustrations asa result, for example, of manufacturing techniques and/or tolerances,are to be expected. Thus, embodiments described herein should not beconstrued as limited to the particular shapes of regions as illustratedherein but are to include deviations in shapes that result, for example,from manufacturing. For example, a region illustrated or described asflat may, typically, have rough and/or nonlinear features. Moreover,sharp angles that are illustrated may be rounded. Thus, the regionsillustrated in the figures are schematic in nature and their shapes arenot intended to illustrate the precise shape of a region and are notintended to limit the scope of the present claims.

Further, in this specification, the phrase “on a plane” means viewing atarget portion from the top (e.g., in a top plan view), and the phrase“on a cross-section” means viewing a cross-section formed by verticallycutting a target portion from the side.

FIG. 1 to FIG. 8 are respectively enlarged cross-sectional viewsschematically showing exemplary embodiments of a display device. FIG. 1to FIG. 4 may represent a non-emissive display device for which light isprovided thereto from outside the illustrated structure. FIG. 5 to FIG.8 may represent an emissive display device for which light is internallyprovided. For the non-emissive display device and the emissive displaydevice, light may be used to display an image.

Referring to FIG. 1, a display device includes a first pixel PX1, asecond pixel PX2, and a third pixel PX3. The first pixel PX1, the secondpixel PX2, and the third pixel PX3 represent different colors from eachother. That is, different color light may be respectively emitted fromthe first pixel PX1, the second pixel PX2, and the third pixel PX3. Inan exemplary embodiment, for example, the first pixel PX1 may representred, the second pixel PX2 may represent green, and the third pixel PX3may represent blue.

Also, the display device includes a first display panel 100, a seconddisplay panel 200, and a light control layer such as a liquid crystallayer 300. The liquid crystal layer 300 is disposed between the firstdisplay panel 100 and the second display panel 200. A light source (notshown) may provide light to the display device, and the display devicemay display an image with the light provided from the light source,without being limited thereto.

The display device and elements thereof may be disposed in a planedefined by first and second directions which cross each other. In FIG.1, the horizontal direction may represent the first direction and/or thesecond direction. A thickness of the display device and elements thereofextends in a third direction which crosses each of the first and seconddirections. In FIG. 1, the vertical direction represents the thirddirection. The directions described above may be similarly applied tothe various display devices shown in FIG. 1 to FIG. 8.

The first display panel 100 includes a first substrate 110, a transistorTr, an insulating layer 120, and a pixel electrode 130. One or more ofthese elements may be provided in plural within the first display panel100.

The first substrate 110 includes glass or plastic. The transistor Tr isdisposed on the first substrate 110, and the insulating layer 120 isdisposed on the transistor Tr and the first substrate 110. The pixelelectrode 130 is disposed on the insulating layer 120 and is connectedto the transistor Tr.

The first pixel PX1, the second pixel PX2, and the third pixel PX3 eachinclude the transistor Tr, the pixel electrode 130, and a portion of theliquid crystal layer 300.

The second display panel 200 includes a second substrate 210, a redcolor filter 230R, a green color filter 230G, a blue color filter 230B,a red light conversion layer 240R, a green light conversion layer 240G,a blue light conversion layer 240B, a barrier layer 250, and a commonelectrode 270. The red color filter 230R, the green color filter 230G,the blue color filter 230B, the red light conversion layer 240R, thegreen light conversion layer 240G, the blue light conversion layer 240B,the barrier layer 250, and the common electrode 270 are disposed betweenthe second substrate 210 and the first display panel 100. The commonelectrode 270 faces the pixel electrode 130 via the liquid crystal layer300.

The first pixel PX1 may include the red color filter 230R and the redlight conversion layer 240R, the second pixel PX2 may include the greencolor filter 230G and the green light conversion layer 240G, and thethird pixel PX3 may include the blue color filter 230B and the bluelight conversion layer 240B.

Also, each of the first pixel PX1, the second pixel PX2, and the thirdpixel PX3 include a portion of the barrier layer 250 and a portion ofthe common electrode 270. The barrier layer 250 and the common electrode270 are commonly disposed with respect to each of the first pixel PX1,the second pixel PX2, and the third pixel PX3.

The second substrate 210 includes glass or plastic.

The red color filter 230R, the green color filter 230G, and the bluecolor filter 230B are disposed at a surface of the second substrate 210.

The red light conversion layer 240R, the green light conversion layer240G, and the blue light conversion layer 240B are disposed at a surfaceof the red color filter 230R, the green color filter 230G, and the bluecolor filter 230B.

That is, along a thickness of the display device, such as in a top planview of the display device, the red light conversion layer 240R overlapsthe red color filter 230R, the green light conversion layer 240Goverlaps the green color filter 230G, and the blue light conversionlayer 240B overlaps the blue color filter 230B.

The red light conversion layer 240R converts light supplied from a lightsource (not shown) into red light to be emitted from the red lightconversion layer 240R, and the green light conversion layer 240Gconverts light supplied from the light source (not shown) into greenlight to be emitted from the green light conversion layer 240G. The bluelight conversion layer 240B converts light supplied from the lightsource (not shown) into blue light to be emitted from the blue lightconversion layer 240B. The red light conversion layer 240R, the greenlight conversion layer 240G, and the blue light conversion layer 240Bmay together form a light conversion layer. The red light emitted fromthe red light conversion layer 240R, the green light emitted from thegreen light conversion layer 240G and the blue light emitted from theblue light conversion layer 240B may be respectively provided to the redcolor filter 230R, the green color filter 230G, and the blue colorfilter 230B to be incident thereto. That is, a light emission directionmay be in a direction from the first display panel 100 to the seconddisplay panel 200, without being limited thereto.

The red light conversion layer 240R, the green light conversion layer240G, and the blue light conversion layer 240B each include a pluralityof a quantum dot 245. The quantum dot 245 may be selected from a GroupII-VI compound, a Group III-V compound, a Group IV-VI compound, a GroupIV element, a Group IV compound, and a combination thereof.

The Group II-VI compound may be selected from a binary compound selectedfrom CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and acombination thereof; a ternary compound selected from CdSeS, CdSeTe,CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe,CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS, anda combination thereof; and a quaternary compound selected from HgZnTeS,CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS,HgZnSeTe, HgZnSTe, and a combination thereof.

The Group III-V compound may be selected from a binary compound selectedfrom GaN, GaP, GaAs, GaSb, AlN, AIP, AIAs, AlSb, InN, InP, InAs, InSb,and a combination thereof; a ternary compound selected from GaNP, GaNAs,GaNSb, GaPAs, GaPSb, AINP, AINAs, AINSb, AIPAs, AIPSb, InNP, InNAs,InNSb, InPAs, InPSb, and a combination thereof; and a quaternarycompound selected from GaAINAs, GaAINSb, GaAIPAs, GaAIPSb, GaInNP,GaInNAs, GaInNSb, GaInPAs, GaInPSb, GaAINP, InAINP, InAINAs, InAINSb,InAIPAs, InAIPSb, and a combination thereof.

The Group IV-VI compound may be selected from a binary compound selectedfrom SnS, SnSe, SnTe, PbS, PbSe, PbTe, and a combination thereof; aternary compound selected from SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe,PbSTe, SnPbS, SnPbSe, SnPbTe, and a combination thereof; and aquaternary compound selected from SnPbSSe, SnPbSeTe, SnPbSTe, and acombination thereof. The Group IV element may be selected from Si, Ge,and a combination thereof. The Group IV compound may be a binarycompound selected from SiC, SiGe, and a combination thereof.

The binary compound, the ternary compound, or the quaternary compoundmay exist in particles at a uniform concentration, or may exist as thesame particle divided into states where concentration distributionspartially differ. Further, the quantum dot may have a core/shellstructure where one quantum dot surrounds another quantum dot. Aninterface between the core and the shell may have a concentrationgradient, such that a concentration of an element existing in the shellis gradually reduced as a distance to the center thereof decreases.

The quantum dot 245 may have a full width at half maximum (“FWHM”) of alight-emitting wavelength spectrum which is less than about 45nanometers (nm), or more particularly about 40 nm or about 30 nm. Inthese ranges of the plurality of the quantum dot 245, the color purityand reproducibility of the display device may be improved.

In addition, shapes of the quantum dot 245 are not specifically limitedto shapes that are generally used in the related art. In exemplaryembodiments, a nanoparticle having a spherical, pyramidal, multi-arm, orcubic shape, a nanotube, a nanowire, a nanofiber, and a planarnanoparticle are used as the quantum dot 245.

Thicknesses of the red light conversion layer 240R, the green lightconversion layer 240G, and the blue light conversion layer 240B may bethe same, and an amount of the quantum dot 245 included in the red lightconversion layer 240R, the green light conversion layer 240G, and theblue light conversion layer 240B may be different.

In an exemplary embodiment, for example, as shown in FIG. 1 by the dotswithin the red light conversion layer 240R, the green light conversionlayer 240G, and the blue light conversion layer 240B, the amount of thequantum dot 245 included in the red light conversion layer 240R may belarger than each of the amount of the quantum dot 245 included in thegreen light conversion layer 240G and the amount of the quantum dot 245included in the blue light conversion layer 240B. The amount of thequantum dot 245 included in the green light conversion layer 240G andthe amount of the quantum dot 245 included in the blue light conversionlayer 240B may be the same. Accordingly, a defect of the first pixel PX1due to a defective red color filter 230R may be minimized by the redlight conversion layer 240R. That is, the red light conversion layer240R may reduce or effectively prevent color stain or smearing at thefirst pixel PX1 or minimize the color difference at the first pixel PX1.

Where FIG. 1 shows, the amount of the quantum dot 245 included in thered light conversion layer 240R may be larger than each of the amount ofthe quantum dot 245 included in the green light conversion layer 240Gand the amount of the quantum dot 245 included in the blue lightconversion layer 240B, a display device is not limited thereto. In anexemplary embodiment, the amount of the quantum dot 245 included in thegreen light conversion layer 240G may be larger than each of the amountof the quantum dot 245 included in the red light conversion layer 240Rand the amount of the quantum dot 245 included in the blue lightconversion layer 240B. That is, the smearing at the second pixel PX2 maybe reduced or effectively prevented or the color difference at thesecond pixel PX2 may be minimized.

In an exemplary embodiment, the amount of the quantum dot 245 includedin the blue light conversion layer 240B may be larger than each of theamount of the quantum dot 245 included in the red light conversion layer240R and the amount of the quantum dot 245 included in the green lightconversion layer 240G. That is, the smearing at the third pixel PX3 maybe reduced or effectively prevented or the color difference at the thirdpixel PX3 may be minimized.

The larger amount of the quantum dot 245 described above for arespective light conversion layer among the red light conversion layer240R, the green light conversion layer 240G, and the blue lightconversion layer 240B, may be the maximum amount of the quantum dot 245among the red light conversion layer 240R, the green light conversionlayer 240G, and the blue light conversion layer 240B. In FIG. 1, onecolor pixel among the first pixel PX1, the second pixel PX2, and thethird pixel PX3 may have the maximum amount of the quantum dot 245.

The red light conversion layer 240R, the green light conversion layer240G, and the blue light conversion layer 240B may each further includea light scattering member. The light scattering member may include anymaterial that can evenly scatter light incident thereto. In an exemplaryembodiment, for example, the light scattering member may include one ofTiO₂, ZrO₂, Al₂O₃, In₂O₃, ZnO, SnO₂, Sb₂O₃, and indium tin oxide(“ITO”).

The barrier layer 250 is commonly disposed at a surface of each of thered light conversion layer 240R, the green light conversion layer 240G,and the blue light conversion layer 240B. The barrier layer 250 servesto protect the red light conversion layer 240R, the green lightconversion layer 240G, and the blue light conversion layer 240B in themanufacturing process of the second display panel 200. The barrier layer250 may include an inorganic material or an organic material.

The common electrode 270 is disposed at a surface of the barrier layer250.

Referring to FIG. 2, the display device is the same that of the displaydevice according to FIG. 1, except for the structure of the red lightconversion layer 240R, the green light conversion layer 240G, and theblue light conversion layer 240B. Therefore, the description of the samestructures is omitted.

Thicknesses of the red light conversion layer 240R, the green lightconversion layer 240G, and the blue light conversion layer 240B may bethe same, and the amount of the quantum dot 245 included in the redlight conversion layer 240R, the green light conversion layer 240G, andthe blue light conversion layer 240B may be different. In an exemplaryembodiment, for example, as shown in FIG. 2, the amount of the quantumdot 245 included in the red light conversion layer 240R and the amountof the quantum dot 245 included in the green light conversion layer 240Gmay be larger than the amount of the quantum dot 245 included in theblue light conversion layer 240B. The amount of the quantum dot 245included in the red light conversion layer 240R and the amount of thequantum dot 245 included in the green light conversion layer 240G may bethe same. Therefore, a defect of the first pixel PX1 due to a defect ofthe red color filter 230R may be minimized by the red light conversionlayer 240R, and a defect of the second pixel PX2 due to the green colorfilter 230G may be minimized by the green light conversion layer 240G.That is, the red light conversion layer 240R and the green lightconversion layer 240G may reduce or effectively prevent smearing at eachof the first pixel PX1 and the second pixel PX2 or minimize the colordifference at each of the first pixel PX1 and the second pixel PX2.

Where FIG. 2 shows the amount of the quantum dot 245 included in the redlight conversion layer 240R and the amount of the quantum dot 245included in the green light conversion layer 240G is larger than theamount of the quantum dot 245 included in the blue light conversionlayer 240B a display device is not limited thereto. In an exemplaryembodiment, the amount of the quantum dot 245 included in the greenlight conversion layer 240G and the amount of the quantum dot 245included in the blue light conversion layer 240B may be larger than theamount of the quantum dot 245 included in the red light conversion layer240R. That is, the smearing at each of the second pixel PX2 and thethird pixel PX3 may be reduced or effectively prevented or the colordifference at each of the second pixel PX2 and the third pixel PX3 maybe minimized.

In an exemplary embodiment, the amount of the quantum dot 245 includedin the red light conversion layer 240R and the amount of the quantum dot245 included in the blue light conversion layer 240B may be larger thanthe amount of the quantum dot 245 included in the green light conversionlayer 240G. That is, the smearing at the first pixel PX1 and the thirdpixel PX3 may be reduced or effectively prevented or the colordifference at the first pixel PX1 and the third pixel PX3 may beminimized.

The larger amounts of the quantum dot 245 described above for therespective light conversion layers among the red light conversion layer240R, the green light conversion layer 240G, and the blue lightconversion layer 240B, may be the maximum amount of the quantum dot 245among the red light conversion layer 240R, the green light conversionlayer 240G, and the blue light conversion layer 240B. In FIG. 2, morethan one color pixel among the first pixel PX1, the second pixel PX2,and the third pixel PX3 may have the maximum amount of the quantum dot245.

Referring to FIG. 3, the display device is the same as the displaydevice according to FIG. 1 except for the structure of the red lightconversion layer 240R, the green light conversion layer 240G, the bluelight conversion layer 240B, and the barrier layer 250. Therefore, thedescription of the same structures is omitted.

Thicknesses of the red light conversion layer 240R, the green lightconversion layer 240G, and the blue light conversion layer 240B may bedifferent. In an embodiment, for example, as shown in FIG. 3, thethickness of the green light conversion layer 240G may be greater thaneach of the thicknesses of the red light conversion layer 240R and theblue light conversion layer 240B. The thicknesses of the red lightconversion layer 240R and the blue light conversion layer 240B may bethe same. Accordingly, the thickness of the barrier layer 250corresponding to the red light conversion layer 240R and the blue lightconversion layer 240B may be greater than the thickness of the barrierlayer 250 corresponding to the green light conversion layer 240G.

A relative thickness of the red light conversion layer 240R, the greenlight conversion layer 240G, the blue light conversion layer 240B maydefine a relative amount of the quantum dot 245 include therein. As thethickness of the green light conversion layer 240G is greater than thethicknesses of the red light conversion layer 240R and the blue lightconversion layer 240B, the amount of the quantum dot 245 included in thegreen light conversion layer 240G becomes larger than the amount of thequantum dot 245 included in the red light conversion layer 240R and theamount of the quantum dot 245 in the blue light conversion layer 240B.Accordingly, a defect of the second pixel PX2 due to a defect of thegreen color filter 230G may be minimized by the green light conversionlayer 240G. In other words, the green light conversion layer 240G mayreduce or effectively prevent the smearing at the second pixel PX2 orminimize the color difference at the second pixel PX2.

Where FIG. 3 shows the thickness of the green light conversion layer240G is greater than each of the thicknesses of the red light conversionlayer 240R and the blue light conversion layer 240B, a display device isnot limited thereto. In an exemplary embodiment, the thickness of thered light conversion layer 240R may be greater than each of thethicknesses of the green light conversion layer 240G and the blue lightconversion layer 240B. That is, the smearing at the first pixel PX1 maybe reduced or effectively prevented or the color difference at the firstpixel PX1 may be minimized.

In an exemplary embodiment, the thickness of the blue light conversionlayer 240B may be greater than each of the thicknesses of the red lightconversion layer 240R and the green light conversion layer 240G. Thatis, the smearing at the third pixel PX3 may be reduced or effectivelyprevented or the color difference at the third pixel PX3 may beminimized. The greater thickness described above for a respective lightconversion layer among the red light conversion layer 240R, the greenlight conversion layer 240G, and the blue light conversion layer 2408,may be the maximum thickness among the red light conversion layer 240R,the green light conversion layer 240G, and the blue light conversionlayer 240B. In FIG. 3, one color pixel among the first pixel PX1, thesecond pixel PX2, and the third pixel PX3 may have the maximumthickness.

Referring to FIG. 4, the display device is the same as the displaydevice according to FIG. 1, except for the structure of the red lightconversion layer 240R, the green light conversion layer 240G, the bluelight conversion layer 240B, and the barrier layer 250. Therefore, thedescription of the same structure is omitted.

Thicknesses of the red light conversion layer 240R, the green lightconversion layer 240G, and the blue light conversion layer 240B may bedifferent. In an exemplary embodiment, for example, as shown in FIG. 4,each of the thicknesses of the red light conversion layer 240R and thegreen light conversion layer 240G may be greater than the thickness ofthe blue light conversion layer 240B. The thicknesses of the red lightconversion layer 240R and the green light conversion layer 240G may bethe same. Accordingly, the thickness of the barrier layer 250corresponding to the blue light conversion layer 240B may be greaterthan the thickness of the barrier layer 250 corresponding to the redlight conversion layer 240R and the green light conversion layer 240G.

As the thicknesses of the red light conversion layer 240R and the greenlight conversion layer 240G is greater than the thickness of the bluelight conversion layer 240B, the amount of the quantum dot 245 includedin the red light conversion layer 240R and the green light conversionlayer 240G becomes larger than the amount of the quantum dot 245included in the blue light conversion layer 240B. Accordingly, a defectat the first pixel PX1 due to a defect of the red color filter 230R maybe minimized by the red light conversion layer 240R, and a defect at thesecond pixel PX2 due to a defect of the green color filter 230G may beminimized by the green light conversion layer 240G. That is, the redlight conversion layer 240R and the green light conversion layer 240Gmay reduce or effectively prevent the smearing at the first pixel PX1and the second pixel PX2 or minimize the color difference at the firstpixel PX1 and the second pixel PX2.

Where FIG. 4 shows each of the thicknesses of the red light conversionlayer 240R and the green light conversion layer 240G may be greater thanthe thickness of the blue light conversion layer 240B, a display deviceis not limited thereto. In an exemplary embodiment, each of thethicknesses of the green light conversion layer 240G and the blue lightconversion layer 240B may be greater than the thickness of the red lightconversion layer 240R. That is, the smearing at the second pixel PX2 andthe third pixel PX3 may be reduced or effectively prevented and thecolor difference at the second pixel PX2 and the third pixel PX3 may beminimized.

In an exemplary embodiment, each of the thicknesses of the red lightconversion layer 240R and the blue light conversion layer 240B may begreater than the thickness of the green light conversion layer 240G.That is, the smearing at the first pixel PX1 and the third pixel PX3 maybe reduced or effectively prevented or the color difference at the firstpixel PX1 and the third pixel PX3 may be minimized.

The greater thickness described above for respective light conversionlayers among the red light conversion layer 240R, the green lightconversion layer 240G, and the blue light conversion layer 240B, may bethe maximum thickness among the red light conversion layer 240R, thegreen light conversion layer 240G, and the blue light conversion layer240B. In FIG. 4, more than one color pixel among the first pixel PX1,the second pixel PX2, and the third pixel PX3 may have the maximumthickness.

Referring to FIG. 5, the emissive display device includes the firstpixel PX1, the second pixel PX2, and the third pixel PX3. The firstpixel PX1, the second pixel PX2, and the third pixel PX3 displaydifferent colors, respectively. In an exemplary embodiment, for example,the first pixel PX1 may represent red, the second pixel PX2 mayrepresent green, and the third pixel PX3 may represent blue.

Also, the display device includes a first substrate 110, a transistorTr, an insulating layer 120, a light emitting diode (“LED”) LD, a pixeldefinition layer 165, an encapsulation layer 170, and a color conversiondisplay panel 400. One or more of these elements may be provided inplural within the first display panel 100.

The first substrate 110 includes glass or plastic. The transistor Tr isdisposed on the first substrate 110, and the insulating layer 120 isdisposed on the transistor Tr and the first substrate 110. The lightemitting diode (“LED”) LD is disposed on the insulating layer 120 and isconnected to the transistor Tr.

The light emitting diode (“LED”) LD includes a first electrode 140connected to the transistor Tr, a light emission member 150 disposed onthe first electrode 140, and a second electrode 160 disposed on thelight emission member 150. Here, the first electrode 140 may be an anodeof the light emitting diode (“LED”) LD, and the second electrode 160 maybe a cathode of the light emitting diode (“LED”) LD. The first electrode140 includes a conductive material which reflects light, and the secondelectrode 160 may include a transparent conductive material such asindium tin oxide (“ITO”), indium zinc oxide (“IZO”), and the like.Therefore, light emitted from the light emission member 150 is emittedin direction of the second electrode 160 from the first electrode 140.

The pixel definition layer 165 is disposed on the insulating layer 120and the first electrode 140. The pixel definition layer 165 defines anopening therein which overlaps the first electrode 140. The opening maydefine a light emission area within a respective one of the first pixelPX1, the second pixel PX2, and the third pixel PX3. In the opening ofthe pixel definition layer 165, the first electrode 140 is exposed fromthe pixel definition layer 165, the light emission member 150 isdisposed on the first electrode 140 and the second electrode 160 isdisposed on the light emission member 150.

The encapsulation layer 170 is disposed on the second electrode 160 andprotects the light emitting diode (“LED”) LD from elements such asmoisture and oxygen. The encapsulation layer 170 includes a firstinorganic layer 171 disposed on the second electrode 160, an organiclayer 172 disposed on the first inorganic layer 171, and a secondinorganic layer 173 disposed on the organic layer 172. Alternatively,the encapsulation layer 170 may be a multi-layer structure having fouror more layers in which the inorganic layer and the organic layer arerepeatedly stacked.

The first pixel PX1, the second pixel PX2, and the third pixel PX3 eachinclude the transistor Tr, the light emitting diode (“LED”) LD, aportion of the pixel definition layer 165, and a portion of theencapsulation layer 170.

The color conversion display panel 400 is disposed on the encapsulationlayer 170. The color conversion display panel 400 includes the secondsubstrate 210, the red color filter 230R, the green color filter 230G,the blue color filter 230B, the red light conversion layer 240R, thegreen light conversion layer 240G, the blue light conversion layer 240B,and the barrier layer 250. The red color filter 230R, the green colorfilter 230G, the blue color filter 230B, the red light conversion layer240R, the green light conversion layer 240G, the blue light conversionlayer 240B, and the barrier layer 250 are disposed between the secondsubstrate 210 and the encapsulation layer 170. The barrier layer 250 isdisposed on the encapsulation layer 170. The barrier layer 250 and theencapsulation layer 170 may be adhered to each other by an adhesivelayer (not shown).

The first pixel PX1 may include the red color filter 230R and the redlight conversion layer 240R, the second pixel PX2 may include the greencolor filter 230G and the green light conversion layer 240G, and thethird pixel PX3 may include the blue color filter 230B and the bluelight conversion layer 240B. Also, the first pixel PX1, the second pixelPX2, and the third pixel PX3 each include a portion of the barrier layer250.

The structure of the color conversion display panel 400 is the same asthe structure in which the common electrode 270 is omitted in the seconddisplay panel 200 of the liquid crystal display as the display deviceaccording to FIG. 1. That is, the red light conversion layer 240R, thegreen light conversion layer 240G, and the blue light conversion layer240B are respectively disposed at a surface of the red color filter230R, the green color filter 230G, and the blue color filter 230B. Thatis, along a thickness of the display device, the red light conversionlayer 240R overlaps the red color filter 230R, the green lightconversion layer 240G overlaps the green color filter 230G, and the bluelight conversion layer 240B overlaps the blue color filter 2308.

The red light conversion layer 240R converts light supplied from thelight emitting diode (“LED”) LD into the red light to be emitted fromthe red light conversion layer 240R, and the green light conversionlayer 240G converts light supplied from the light emitting diode (“LED”)LD into the green light to be emitted from the green light conversionlayer 240G. The blue light conversion layer 240B converts light suppliedfrom the light emitting diode (“LED”) LD into the blue light to beemitted from the blue light conversion layer 240B.

The red light conversion layer 240R, the green light conversion layer240G, and the blue light conversion layer 240B include a quantum dot 245provided in plurality. The quantum dot 245 may be selected from a GroupII-VI compound, a Group III-V compound, a Group IV-VI compound, a GroupIV element, a Group IV compound, and a combination thereof.

The thicknesses of the red light conversion layer 240R, the green lightconversion layer 240G, and the blue light conversion layer 240B may bethe same, and the amount of the quantum dot 245 included in the redlight conversion layer 240R, the green light conversion layer 240G, andthe blue light conversion layer 240B may be different. In an exemplaryembodiment, for example, as shown in FIG. 5, the amount of the quantumdot 245 included in the red light conversion layer 240R may be largerthan each of the amount of the quantum dot 245 included in the greenlight conversion layer 240G and the amount of the quantum dot 245included in the blue light conversion layer 240B. The amount of thequantum dot 245 included in the green light conversion layer 240G andthe blue light conversion layer 240B may be the same. Accordingly, adefect of the first pixel PX1 due to a defective red color filter 230Rmay be minimized by the red light conversion layer 240R. That is, thered light conversion layer 240R may reduce or effectively preventsmearing at the first pixel PX1 or minimize the color difference at thefirst pixel PX1.

Where FIG. 5 shows the amount of the quantum dot 245 included in the redlight conversion layer 240R may be larger than the amount of the quantumdot 245 included in the green light conversion layer 240G and the amountof the quantum dot 245 included in the blue light conversion layer 240B,a display device is not limited thereto. In an exemplary embodiment, theamount of the quantum dot 245 included in the green light conversionlayer 240G may be larger than the amount of the quantum dot 245 includedin the red light conversion layer 240R and the amount of the quantum dot245 included in the blue light conversion layer 240B. That is, thesmearing at the second pixel PX2 may be reduced or effectively preventedor the color difference at the second pixel PX2 may be minimized.

In an exemplary embodiment, the amount of the quantum dot 245 includedin the blue light conversion layer 240B may be larger than the amount ofthe quantum dos 245 included in the red light conversion layer 240R andthe amount of the quantum dot 245 included in the green light conversionlayer 240G. That is, the smearing at the third pixel PX3 may be reducedor effectively prevented or the color difference at the third pixel PX3may be minimized.

Referring to FIG. 6, the display device is the same as the displaydevice according to FIG. 5 except for the structure of the red lightconversion layer 240R, the green light conversion layer 240G, and theblue light conversion layer 2408. Therefore, the description of the samestructures is omitted.

The thicknesses of the red light conversion layer 240R, the green lightconversion layer 240G, and the blue light conversion layer 240B may bethe same, and the amount of the quantum dot 245 included in the redlight conversion layer 240R, the green light conversion layer 240G, andthe blue light conversion layer 240B may be different. In an exemplaryembodiment, for example, as shown in FIG. 6, the amount of the quantumdot 245 included in each of the red light conversion layer 240R and thegreen light conversion layer 240G may be larger than the amount of thequantum dot 245 included in the blue light conversion layer 240B. Theamount of the quantum dot 245 included in the red light conversion layer240R and the green light conversion layer 240G may be the same.Therefore, a defect of the first pixel PX1 due to a defect of the redcolor filter 230R may be minimized by the red light conversion layer240R, and a defect of the second pixel PX2 due to the green color filter230G may be minimized by the green light conversion layer 240G. That is,the red light conversion layer 240R and the green light conversion layer240G may reduce or effectively prevent smearing at the first pixel PX1and the second pixel PX2 or minimize the color difference at the firstpixel PX1 and the second pixel PX2.

Where FIG. 6 shows the amount of the quantum dot 245 included in each ofthe red light conversion layer 240R and the green light conversion layer240G is larger than the amount of the quantum dot 245 included in theblue light conversion layer 240B, a display device is not limitedthereto. The amount of the quantum dot 245 included each of in the greenlight conversion layer 240G and the blue light conversion layer 240B maybe larger than the amount of the quantum dot 245 included in the redlight conversion layer 240R. That is, the smearing at the second pixelPX2 and the third pixel PX3 may be reduced or effectively prevented orthe color difference at the second pixel PX2 and the third pixel PX3 maybe minimized.

In an exemplary embodiment, the amount of the quantum dot 245 includedin each of the red light conversion layer 240R and the blue lightconversion layer 240B may be larger than the amount of the quantum dot245 included in the green light conversion layer 240G. That is, thesmearing at the first pixel PX1 and the third pixel PX3 may be reducedor effectively prevented or the color difference at the first pixel PX1and the third pixel PX3 may be minimized.

Referring to FIG. 7, the display device is the same as the displaydevice according to FIG. 5, except for the structure of the red lightconversion layer 240R, the green light conversion layer 240G, the bluelight conversion layer 240B, and the barrier layer 250. Therefore, thedescription of the same structures is omitted.

Thicknesses of the red light conversion layer 240R, the green lightconversion layer 240G, and the blue light conversion layer 240B may bedifferent. In an exemplary embodiment, for example, as shown in FIG. 7,the thickness of the green light conversion layer 240G may be greaterthan each of the thicknesses of the red light conversion layer 240R andthe blue light conversion layer 240B. The thicknesses of the red lightconversion layer 240R and the blue light conversion layer 240B may bethe same. Accordingly, each of the thickness of the barrier layer 250corresponding to the red light conversion layer 240R and the blue lightconversion layer 240B may be greater than the thickness of the barrierlayer 250 corresponding to the green light conversion layer 240G.

As the thickness of the green light conversion layer 240G is greaterthan each of the thicknesses of the red light conversion layer 240R andthe blue light conversion layer 240B, the amount of the quantum dot 245included in the green light conversion layer 240G becomes larger thanthe amount of the quantum dot 245 included in each of the red lightconversion layer 240R and the blue light conversion layer 240B.Accordingly, a defect of the second pixel PX2 due to a defect of thegreen color filter 230G may be minimized by the green light conversionlayer 240G. In other words, the green light conversion layer 240G mayreduce or effectively prevent smearing at the second pixel PX2 orminimize the color difference at the second pixel PX2.

Where FIG. 7 shows the thickness of the green light conversion layer240G is greater than each of the thicknesses of the red light conversionlayer 240R and the blue light conversion layer 240B, a display device isnot limited thereto. The thickness of the red light conversion layer240R may be greater than each of the thicknesses of the green lightconversion layer 240G and the blue light conversion layer 240B. That is,the smearing at the first pixel PX1 may be reduced or effectivelyprevented or the color difference at the first pixel PX1 may beminimized.

In an exemplary embodiment, the thickness of the blue light conversionlayer 240B may be greater than each of the thicknesses of the red lightconversion layer 240R and the green light conversion layer 240G. Thatis, the smearing at the third pixel PX3 may be reduced or effectivelyprevented or the color difference at the third pixel PX3 may beminimized.

Referring to FIG. 8, the display device is the same as the displaydevice according to FIG. 5, except for the structure of the red lightconversion layer 240R, the green light conversion layer 240G, the bluelight conversion layer 240B, and the barrier layer 250 rest structure.Therefore, the description of the same structures is omitted.

Thicknesses of the red light conversion layer 240R, the green lightconversion layer 240G and the blue light conversion layer 240B may bedifferent. In an exemplary embodiment, for example, as shown in FIG. 8,each of the thicknesses of the red light conversion layer 240R and thegreen light conversion layer 240G may be greater than the thickness ofthe blue light conversion layer 240B. That is, the thicknesses of thered light conversion layer 240R and the green light conversion layer240G may be the same. Accordingly, the thickness of the barrier layer250 corresponding to the blue light conversion layer 240B may be greaterthan the thickness of the barrier layer 250 corresponding to each of thered light conversion layer 240R and the green light conversion layer240G.

As each of the thicknesses of the red light conversion layer 240R andthe green light conversion layer 240G are greater than the thickness ofthe blue light conversion layer 240B, each of the amount of the quantumdot 245 included in the red light conversion layer 240R and the greenlight conversion layer 240G becomes larger than the amount of thequantum dot 245 included in the blue light conversion layer 240B.Accordingly, a defect of the first pixel PX1 due to a defect of the redcolor filter 230R may be minimized by the red light conversion layer240R, and a defect of the second pixel PX2 due to a defect of the greencolor filter 230G may be minimized by the green light conversion layer240G. That is, the red light conversion layer 240R and the green lightconversion layer 240G may reduce or effectively prevent the smearing atthe first pixel PX1 and the second pixel PX2 or minimize the colordifference at the first pixel PX1 and the second pixel PX2.

Where FIG. 8 shows each of the thicknesses of the red light conversionlayer 240R and the green light conversion layer 240G are greater thanthe thickness of the blue light conversion layer 240B, a display deviceis not limited thereto. In an exemplary embodiment, each of thethicknesses of the green light conversion layer 240G and the blue lightconversion layer 240B may be greater than the thickness of the red lightconversion layer 240R. That is, the smearing at the second of the secondpixel PX2 and the third pixel PX3 may be reduced or effectivelyprevented and the color difference at the second of the second pixel PX2and the third pixel PX3 may be minimized.

In an exemplary embodiment, each of the thicknesses of the red lightconversion layer 240R and the blue light conversion layer 240B may begreater than the thickness of the green light conversion layer 240G.That is, the smearing at the first pixel PX1 and the third pixel PX3 maybe reduced or effectively prevented or the color difference at the firstpixel PX1 and the third pixel PX3 may be minimized.

While this invention has been described in connection with what ispresently considered to be practical exemplary embodiments, it is to beunderstood that the invention is not limited to the disclosedembodiments, but, on the contrary, is intended to cover variousmodifications and equivalent arrangements included within the spirit andscope of the appended claims.

What is claimed is:
 1. A display device comprising: a plurality ofpixels including a first pixel, a second pixel, and a third pixel fromwhich lights of different colors are respectively emitted; a pluralityof color filters respectively corresponding to the plurality of pixels;and a plurality of light conversion layers each overlapping a colorfilter among the plurality of color filters, the plurality of lightconversion layers including: in the first pixel, a first lightconversion layer including an amount of a quantum dot which overlaps afirst color filter; in the second pixel, a second light conversion layerincluding an amount of a quantum dot which overlaps a second colorfilter; and in the third pixel, a third light conversion layer includingan amount of a quantum dot which overlaps a third color filter, whereinamong the plurality of light conversion layers which each overlaps thecolor filter among the plurality of color filters: the amount of thequantum dot which overlaps the first color filter is larger than each ofthe amount of the quantum dot which overlaps the second color filter andthe amount of the quantum dot which overlaps the third color filter,each of the first light conversion layer, the second light conversionlayer and the third light conversion layer has a thickness defined fromthe first color filter, the second color filter and the third colorfilter, respectively, and the thickness of the first light conversionlayer is greater than each of the thickness of the second lightconversion layer and the thickness of the third light conversion layer.2. The display device of claim 1, wherein the amount of the quantum dotwhich overlaps the second color filter and the amount of the quantum dotwhich overlaps the third color filter are the same.
 3. The displaydevice of claim 2, wherein the thickness of the second light conversionlayer and the thickness of the third light conversion layer are thesame.
 4. The display device of claim 3, wherein each of the first pixel,the second pixel, and the third pixel includes: a transistor; a pixelelectrode connected to the transistor; a common electrode facing thepixel electrode; and a liquid crystal layer disposed between the pixelelectrode and the common electrode.
 5. The display device of claim 3,wherein each of the first pixel, the second pixel, and the third pixelincludes: a transistor; a light emitting diode connected to thetransistor; and an encapsulation layer on the light emitting diode.
 6. Adisplay device comprising: a plurality of pixels including a firstpixel, a second pixel, and a third pixel from which lights of differentcolors are respectively emitted; a plurality of color filtersrespectively corresponding to the plurality of pixels; and a pluralityof light conversion layers each overlapping a color filter among theplurality of color filters, the plurality of light conversion layersincluding: in the first pixel, a first light conversion layer includingan amount of a quantum dot which overlaps a first color filter; in thesecond pixel, a second light conversion layer including an amount of aquantum dot which overlaps a second color filter; and in the thirdpixel, a third light conversion layer including an amount of a quantumdot which overlaps a third color filter, wherein among the plurality oflight conversion layers which each overlaps the color filter among theplurality of color filters: the amount of the quantum dot which overlapsthe first color filter and the amount of the quantum dot which overlapsthe second color filter are both larger than the amount of the quantumdot which overlaps the third color filter, each of the first lightconversion layer, the second light conversion layer and the third lightconversion layer has a thickness defined from the first color filter,the second color filter and the third color filter, respectively, andthe thickness of the first light conversion layer and the thickness ofthe second light conversion layer are both greater than the thickness ofthe third light conversion layer.
 7. The display device of claim 6,wherein the amount of the quantum dot which overlaps the first colorfilter and the amount of the quantum dot which overlaps the second colorfilter are the same.
 8. The display device of claim 7, wherein thethickness of the first light conversion layer and the thickness of thesecond light conversion layer are the same.
 9. The display device ofclaim 8, wherein each of the first pixel, the second pixel, and thethird pixel includes: a transistor; a pixel electrode connected to thetransistor; a common electrode facing the pixel electrode; and a liquidcrystal layer disposed between the pixel electrode and the commonelectrode.
 10. The display device of claim 8, wherein each of the firstpixel, the second pixel, and the third pixel includes: a transistor; alight emitting diode connected to the transistor; and an encapsulationlayer on the light emitting diode.
 11. A display device comprising: afirst display panel including a transistor and an electrode which isconnected to the transistor; and a second display panel including: aplurality of light conversion layers each overlapping a color filteramong the plurality of color filters; a first color filter overlappingan amount of a quantum dot included in a first light conversion layer, asecond color filter overlapping an amount of a quantum dot included in asecond light conversion layer, and a third color filter overlapping anamount of a quantum dot included in a third light conversion layer,wherein among the plurality of light conversion layers which eachoverlaps the color filter among the plurality of color filters: theamount of the quantum dot which overlaps the first color filter islarger than the amount of the quantum dot which overlaps the secondcolor filter or the amount of the quantum dot which overlaps the thirdcolor filter, each of the first light conversion layer, the second lightconversion layer and the third light conversion layer has a thicknessdefined from the first color filter, the second color filter and thethird color filter, respectively, and the thickness of the first lightconversion layer is greater than each of the thickness of the secondlight conversion layer and the thickness of the third light conversionlayer.
 12. The display device of claim 11, wherein the amount of thequantum dot which overlaps the second color filter and the amount of thequantum dot which overlaps the third color filter are the same, and thethickness of the second light conversion layer and the thickness of thethird light conversion layer are the same.
 13. The display device ofclaim 11, further comprising: a liquid crystal layer disposed betweenthe first display panel and the second display panel.
 14. The displaydevice of claim 11, further comprising: a light emitting diode connectedto the transistor, the light emitting diode including the electrode; anencapsulation layer disposed on the light emitting diode; and the seconddisplay panel disposed on the encapsulation layer.